Category: U

Urn-shaped, with a swollen tube contracted near the top and then slightly expanded in a narrow rim.  

(In nomenclature) usually refers to a name that occurs only on a herbarium sheet or in an unpublished manuscript, and therefore invalid.  

With a single anther cell.  

(Of anther) with a single anther cell.  

With a single covering to the ovules.  

With a single partition.  

In a single whorl or series.  

(In branching) with only a single axis produced at each branching point (as in some cymes: can result in a zig-zag cyme or in a scorpioid one). Giving birth to one offspring at a time. Having birthed only one child.  

(Of carpels or ovaries) with a single ovule.  

Of one node.